425oz or 269oz ?

[gun_maker]

So here is the question. While reading threw the Xylotex site I had seen the 425oz 3 axis kit. I figured it was going to be a few hundred dollars more but to my suprize it is only $30 more. So It has me thinking is bigger better? The only thing that has stopped me from turning over the CCard number is this statement.

"You will be able to get more low-speed torque using these motors compared to the 269 oz.in. motors. However, these motors have a higher inductance. This means a limited top-end speed."

So does this mean that I can expect slower speeds than the 269's or the same speed but if I decide to pick up some geckos it isnt going to help.

Here is a link to the website. 425oz

I plan on putting these on the solsylva large table 37x25x6

[sdantonio]

There was another thread about a month ago where, if I remember it right, someone was pushing motors this size with a xylotec board and was vary unhappy with the speed. I think his solution was to build a set of picsteps. You should get pretty good speed from these motors and the gecko's though. If top end speed isn't an issue then the xylotec package should work fine.

[ger21]

Use higher lead screws, so the motor spins slower where it has more torque. Somewhere between 2 and 5 turns per inch. This should also give you a faster machine.

[gun_maker]

I am going to send a email. This is my first build and I know that I will upgrade to a larger table or mill later on. That is why Im interested in the 425oz. But for now I want to stick with the plan of 1/4 20 allthread. I just wanted to know if they will spin just as fast as the 269oz for now, while I learn and figure out exactly what I want. Thanks for you help guys.

[spalm]

Gun Maker,

Seems like you want to close this thread, but I have to agree with Gerry. Use a higher lead leadscrew. You will be able to keep the RPMs down to a more reasonable speed where your motors will produce more torque and you will keep that 37” long 1/4" screw from whipping like an egg beater.

(and I bet you will appreciate “faster”)

Steve

[sdantonio]

Originally Posted by gun_maker I want to stick with the plan of 1/4 20 allthread.

I can understand sticking with the plan for the first machine. But I would still strongly recomend going 1/2-10 acme rod at least, maybe even 1/2-4 double start.

But the good thing with most of the diy machines is that most of the really expensive parts can all be moved to the second machine when you build it. Which set of plans are you building from? Have you looked at Joe's plans available here in the download section?

[gun_maker]

I have decided on using Solsylva Plans just because of the simplicity. Joes looks nice but the degree of difficulty comes along with his plans. I am good at wood working I just have to figure out the mechanics of the machine. I will look into the acme rod would these still fit the skate bearings?

[sdantonio]

the R6 ZZ size skate bearings (1/2"x1-1/8"x5/16" Bearings www.vxb.com) fit the 1/2 inch threaded rod perfectly

[gun_maker]

Thanks for the link.